We investigate the effect of the thermal imbalance on the structural stability of the magnetohydrodynamic model of the preflare current layer (Ledentsov in Solar. Phys. 296, 74, 2021). The piecewise homogeneous model of the current layer is supplemented by a magnetic field longitudinal with respect to the direction of the current. It is shown that the presence of a weak longitudinal field does not change the previously calculated spatial period of the thermal instability in the most expected range of the parameters of the preflare current layer and, moreover, contributes to the formation of the instability. On the other hand, a strong longitudinal magnetic field contributes to the spatial stabilization of the current layer.

我们研究了热失衡对预闪电流层磁流体动力学模型结构稳定性的影响（Ledentsov in Solar. Phys. 296 , 74, 2021）。电流层的分段均匀模型由相对于电流方向纵向的磁场补充。结果表明，在预闪电流层参数的最预期范围内，弱纵向场的存在不会改变先前计算的热不稳定性空间周期，而且有助于不稳定性的形成。另一方面，强纵向磁场有助于电流层的空间稳定性。